641440146 has 32 divisors (see below), whose sum is σ = 1344470400. Its totient is φ = 203629184.

The previous prime is 641440109. The next prime is 641440147. The reversal of 641440146 is 641044146.

641440146 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641440146² = 822890921801002632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641440147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22180 + ... + 42128.

It is an arithmetic number, because the mean of its divisors is an integer number (42014700).

Almost surely, 2^641440146 is an apocalyptic number.

641440146 is an abundant number, since it is smaller than the sum of its proper divisors (703030254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641440146 is a wasteful number, since it uses less digits than its factorization.

641440146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20210.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 641440146 is about 25326.6686715802. The cubic root of 641440146 is about 862.4197877096.

The spelling of 641440146 in words is "six hundred forty-one million, four hundred forty thousand, one hundred forty-six".